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If a barbell weighs 160 N, what other information do you need to calculate how much work it takes to lift it?
Less force is needed to move the object over a longer distance
distance
how high the barbell is being lifted
friction
work input
pulley
the power
power
If an identical stack of books is lifted the same distance and one person does the job twice as fast, which of the following is done twice as much?
Less force is needed to move the object over a longer distance
distance
how high the barbell is being lifted
friction
work input
pulley
the power
power
How does a ramp make lifting a heavy object easier?
Less force is needed to move the object over a longer distance
distance
how high the barbell is being lifted
friction
work input
pulley
the power
power
What is a machine with a grooved wheel that holds a cable?
Less force is needed to move the object over a longer distance
distance
how high the barbell is being lifted
friction
work input
pulley
the power
power
What is the work that you do on a machine?
Less force is needed to move the object over a longer distance
distance
how high the barbell is being lifted
friction
work input
pulley
the power
power
Chris and Jane are lifting boxes to put them on shelves. Chris does 200 J of work in 5 minutes and Jane does 200 J of work in 4 minutes. What is the difference between the two jobs?
Less force is needed to move the object over a longer distance
distance
how high the barbell is being lifted
friction
work input
pulley
the power
power
Force times _______________ is the formula to calculate work.
Less force is needed to move the object over a longer distance
distance
how high the barbell is being lifted
friction
work input
pulley
the power
power
Which of the following causes machines not to be 100% efficienct?
Less force is needed to move the object over a longer distance
distance
how high the barbell is being lifted
friction
work input
pulley
the power
power
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